Vertical diffusion in era 40
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Vertical diffusion in ERA-40. Vertical diffusion in ERA-40. Dirk Olivié 12 November 2003. Overview. Vertical Diffusion Louis, Holtslag, ECMW6h K z –profile Radon distribution Comparison with measurements Ecmwf3h, Ecmwf6h Radon distribution Comparison with measurements.

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Vertical diffusion in ERA-40

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Vertical diffusion in ERA-40

Vertical diffusion in ERA-40

Dirk Olivié

12 November 2003


Overview

  • Vertical Diffusion

  • Louis, Holtslag, ECMW6h

    • Kz –profile

    • Radon distribution

    • Comparison with measurements

  • Ecmwf3h, Ecmwf6h

    • Radon distribution

    • Comparison with measurements


What it’s all about …

Kz : diffusion coefficient [m2s-1]

C : tracer concentration


Overview diffusion data


Louis – Holtslag – ECMWF6h

  • Kz profile

  • Global Radon distribution

  • Comparison with Radon measurement

    • daily cycle

    • correlation


Kz : mean profile

August 1993

Global mean

Over land

Louis

Holtslag

Ecmwf-6h


Louis

Holtslag

Ecmwf-6h

Kz : daily cycle

1h30

4h30

7h30

10h30

13h30

16h30

19h30

21h30


Radon : Holtslag - Louis


Radon : Ecmwf6h - Holtslag


Radon : Ecmwf6h - Louis


Louis

Holtslag

Ecmwf-6h

Measurement

Radon : Surface


Louis

Ecmwf-6hMeasurement

HoltslagNo diffusion

Radon : 1200 m


Correlation : surface

Louis

Holtslag

Ecmwf-6h

Jan Mar May Jul Sep Nov


Correlation : 1200 m

Louis

Holtslag

Ecmwf-6h

Jan Mar May Jul Sep Nov


ECMWF3h-ECMWF6h

  • Global Radon distribution

  • Daily cycle

  • Correlation


ECMWF3h-ECMWF6h


Radon - Daily cycle - surface

Louis

Holtslag

Ecmwf-6h

Ecmwf-3h

Measurement


Radon - Daily cycle – 1200 m

Louis

Holtslag

Ecmwf-6h

Ecmwf-3h

No diffusion

Measurement


Correlation surface

Louis

Holtslag

Ecmwf-6h

Ecmwf-3h

No diffusion

Jun Jul Aug


Correlation : 1200 m

Louis

Holtslag

Ecmwf-6h

Ecmwf-3h

No diffusion

Jun Jul Aug


Radon profile

Louis

Holtslag

Ecmwf-6h

Ecmwf-3h

No diffusion


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